To quickly change a word you can use cw,caw or ciw. Use c$ or just C to quickly change from the cursor to the end of a line, cc to change an entire line, or cis for a sentence.

The standard change word command requires you to type cw, then a new word, then press Escape. Using the version below, you would type pw, then a new word, then press Space to exit back to normal mode. Or, you would type p$, then a new line, then press Enter.